Abstract: An employee parked a concrete pump truck under an overhead power line. As was the usual practice, he was going to wash out the hopper. The boom of the truck was down in the saddled position. However, there was no saddle strap on the boom. While employee was washing out the hopper, the boom rose and contacted the 7200-volt power line. Apparently, the employee's head was touching the concrete spout at the rear of the truck, and he was electrocuted. The pump truck boom up lever (the main override control) was defective and did not return completely to the neutral position. This defect permitted the boom to rise slowly.